BOSFLAG mandrel assembly with pulley for 46-inch mower decks — direct-fit OEM replacement, precision-machined

Replacement mandrel assembly with matching pulley engineered to restore cutting performance on Husqvarna 46" mower decks.

This BOSFLAG kit pairs the 587125201 mandrel assembly with the 539113962 pulley to provide a direct-fit replacement for many Husqvarna, Craftsman, Poulan Pro and Jonsered zero-turn and lawn tractor decks. Built to meet or exceed OEM dimensions, the assembly and pulley are machined for consistent blade alignment and reliable belt tracking so you can get back to mowing quickly without guesswork.

Will this replace my original Husqvarna spindle and pulley?

Yes—this kit is designed as a drop-in substitute for numerous OEM part numbers across brands. The mandrel and pulley match factory diameter, bore and mounting patterns so no machining or alteration is required.

• Replaces 587125201, Craftsman 174358/174356, Oregon 82-012/82-015 and more.
• Pulley specifications: height 0.84", inner diameter 0.63", outer diameter 5.47" for precise belt fit.
• Ships complete with the pulley's correct bore to avoid belt slippage and misalignment.

How durable is the BOSFLAG mandrel and pulley compared with OEM parts?

The kit is manufactured from high-grade aluminum alloy for the mandrel and heavy-duty steel for the pulley, with protective coatings applied to resist corrosion and wear. These materials and finishes help maintain structural integrity under typical lawn-mower loads.

• Aluminum mandrel resists rust and reduces rotational mass for smoother spin.
• Steel pulley is coated to protect against surface corrosion and abrasion from belts.
• Precision machining limits wobble, reducing premature belt and blade wear.

Can I install this myself and what tools do I need?

Installation is intended to be straightforward for most home mechanics; the components adhere to OEM dimensions so they bolt in without modification. Typical replacement takes minutes when you have basic hand tools and a safe, stable workspace.

• Tools commonly required: set of wrenches, sockets, ratchet and screwdriver.
• No specialty presses or custom fabrication needed—fits factory mounting points.
• Follow standard safety steps: disconnect spark plug and secure deck before work.

Which mower models and brands will this kit fit?

This assembly covers a broad range of mower makes and models where the original OEM numbers are specified. Refer to the fitment list to confirm compatibility with your deck before ordering.

• Compatible with many Husqvarna RZ and RZ46 series and related model numbers.
• Also fits Poulan Pro 460ZX, Craftsman 917204130 and Jonsered Z46R where specified.
• Cross-references include multiple Craftsman and Oregon replacement part numbers.

Who this is for: This BOSFLAG mandrel and pulley kit is aimed at homeowners and small-property contractors who need a reliable, OEM-dimension replacement for worn or damaged spindle assemblies on 46" decks. It suits anyone who prefers a DIY repair using standard tools, those preserving older machines with discontinued factory parts, and technicians who require a cost-effective, durable spare for routine maintenance.